Memory Prefix, Suffix & Root MatchVersión en línea Learn how prefixes, suffixes, and roots modify meaning. por Xadicha Abdusattorova act Root meaning: to do or perform. Suffix for a person or thing that performs -ly -ing -ed Present participle; ongoing action. Negation; opposite of the base word. spect -er Root meaning: to look or see. Past tense; action completed. Again or back; repeat action. re- un- Suffix turning adjectives into adverbs.